Impedance bond



Dec. 26, 1 439 0 H- A. ANDERSON ET AL. V 1

IMPEDANCE BOND. FILED JULY 29, 1922.

0 f! F 0 0 o B 4 O Y O I L; "7 14 INVENTORS. H.H- finds/won, H-R.Smfir/s,

M ATTORNEY Patented Dec. 26, 1922.

UNITED STATES PATENT OFFICE.

HER-MAN A. ANDERSON, OF PITTSBURGH, AND HARRY B. SMITH, OF WILKINSBU'RG,PENNSYLVANIA, ASSIGNORS T0 THE UNION SWITCH & SIGNAL COMPANY, OFSWISSVALE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

IMPEDANCE BOND.

Application filed July 29,

To (175 about 2'2, may concern:

Be i known that we, HERMAN A. AnnunsoN and TTARRY B. SMITH, citizens ofthe United States, residing at Pittsburgh and d' illrinsburg,respectively, in the county of Allegheny and State of Pennsylvania, haveinvented certain new and useful Improvements in npedance Bonds, of whichthe following is a specification.

(Tuiinvention relates to impedzzznce bonds, such for example as thebonds which are used in the traclrway when an alternating cur out t Pei:circuit signaling system is an plied to a railway both rails of whichare used for the transmission. of propulsion current.

One object of our invention is the provision of novel. and improvedmeans for rigidly holding an impedance bond in place in the case whichencloses and protects it.

We will describe one form of an imped ance bond embodying our inventionand will then point out the novel features thereof in claims In theaccompanying drawing, Fig. is a plan view, with cover removed, showingone form of bond embodying our invention.

Fig. 2 is a vertical sectional view of the bond shown in Fig. 1. Fig. 3is a fragmentary plan view of the inside of the enclosing case shown inFigs. 1 and 2.

Similar reference characters refer to similar parts in each of theseveral views.

Referring to the drawing, the reference character '10 designates anenclosing and protecting case which is usually of cast iron and isprovided with a cover 10 Located within this case is an impedance bondB, comprising a magnetizable core 13, core plates 11 and 11. for holdingthe laminated elements of the core together, and a winding 12 providedwith terminals 19, 20 and 21 which project through suitable holes in theside of the case 10.

The bond B rests on lugs 15 which are cast in the bottom of the case 10,and is held in place in the case by the means which we will nowdescribe.

Each end of each core plate 11 and 11 is provided with a projecting car17, and each ear has a round aperture 17 designed to receive the shankof a bolt 16. It follows that 1922. Serial No. 578,385.

there are four such apertured ears at the four corners of the bond andnear the top thereof, and four other such apertured ears at the fourcorners of the bond and near the bottom thereof. The two apertures ateach corner register with each other, and also registering with eachpair of apertures are lugs 14, 14?, 1-11 and 1 1, which are cast in thebottom of the case 10. Each of these lugs is slotted, and by this wemean that the lug is provided with a groove having overhanging edges asshown in Figs. 2 and 3. These slot ted lugs hold the squared heads ofthe bolts 16 and. so prevent these bolts from being pulled upwardly. Thebond is held down in the case by nuts 18 screwed onto the upper end ofthe bolts 16 above the top car 17.

The slots in the two diametrically oppo site lugs 14 and 14* areparallel and are at right angles to the slots in the other twodiametrically opposite lugs 1 1 and 14 the slots in these last twomentioned lugs likewise be ing parallel, It will be seen from thisi'angement that when the parts are in place and the nuts 18 aretightened it is impossible for bond B to move horizontally in anydirection in the case 10.

This structure has numerous advantageous features among which are thefollowing: It accomplishes the desired result with the fewest possiblenumber of parts, and owing to the fact that little or no fitting of theparts is necessary, it reduces the cost of assembling to the minimum. Itprovides the maximum opportunity for circulation of petrolatum orwhatever other cooling medium may be contained in the case, because thismedium is free to flow in all directions around the core 18. It holdsthe bond positively in one position in the case, so that even if thestructure is roughly handled. the terminal devices 19, 20 and 21 willnot be disturbed, as frequently happens when the bond is capable ofslight movement in the case. By this we mean that the case is sealedwhere these terminals are brought out and such seal is broken in theevent of relative movement of the bond in the case.

Although we have herein shown and described only one form of bondembodying our invention, it is understood that various changes andmodifications may be made at i.

therein within. the scope of the appended claims without departing fromthe spirit and scope of our invention.

Having thus described our invention, what we claim is:

1. In combination, a case provided with slotted lugs, an impedance bondlocated in said case and comprising apertured core plates, and boltspassing through the apertures in said core plates and having headscoacting with said slotted lugs.

:2. in combination, a case provided with slotted lug the slots incertain. of the lugs being at right angles to the slots in the otherlugs, an impedance bond located in said case and comprising aperturedcore plates, and bolts passing through the apertures in said core platesand having heads coacting with said slotted lugs.

3. In combination, a case provided with slotted lugs, the slots in. saidlugs being disposed in different directionsQan impedance bond located insaid case and comprising apertured core plates, and bolts passingthrough the apertures in. said core plates and having heads coactingwith said slotted lugs.

4. In combination, a case the bottom oi? which is provided with fourlugs, a slot in case and including core plates provided with ears havingapertures which re ter with said slotted lugs, and bolts passi g'h saidapertures and having heads coactino; with the slots in said lugs.

5. In combination, a case provided with 'four slotted lugs so disposer,to form a rectangle, the slots in each two diagonall opposite lugs beingparallel and at right angles to the slots in. the other two dia- 'mallyopposite lugs, an impedance bond located in said case and comprising;two core plates each having apertures which register with the lugs inthe case, tour bolts, one for each lug, and each having a head coactingwith the associated lug and a shank passing; through the correspondingapertures in the core plates, and nuts coactin with said bolts to holdthe bone in place in the case.

in testimony whereoi we afiix our signs, tures.

HERMAN A. ainnnne nanny n. sinrn

